Lock nut



March 18, 193 0. w DIETER 1,750,925

LOCK NUT Filed Feb. 1, 1927 @31 Yu Q Gnome 1 Patented Mar. is, was I v 1,35%25 were stares area? tam PAUL W. DIETEIR I, OF NEW YORK, N. Y.

06K NUT Application filed Eebruary 1, 19:37. Serial. lilo. 165,133.

This invention relates to improvements in Figure 6 is a transverse section of the nut lock nuts of the kind that will be self-lockon the line O-C of Figure 3. ing or binding, without being dependent In the construction and application ofthis upon any auxiliary devices or expedients, invention the standard form of nut blank A when practically applied to its component is used, here shown as square. The first op- 55 member. eration on the nut blank A is to punch there- The object of the present invention is to in in the usual manner between the working produce a nut that will have all the advanfaces 1-1, the central bore 2, after which tages of a standard nut, plus the merits of a said nut has a plurality of axial grooves 3 lock nut, at the same time produce a lock punched, out or otherwise made through the co nut that will meet the accepted standards set bod thereof between the bore 2 and the sides for practicability of operation and economy 4 o the nut; The blank is now in condition of production. to be screw threaded in the manner shown Another object of the invention is to make at 5. a lock nut that will not depend upon an abut- After the nut blank has been punched, the 65 ment to effect the required locking action, axial grooves cut therethrough and the nut that is, having a portion of the nut first abut threaded in the usual manner, the sides 4 some member to gradually cause the threads of said nut are engaged by any suitable to become deformed or to throw the bolt out means, such as co-actin members, two of of axial alinement, but will have any or all which move towards eac other in a manner 7 of its threads self locking upon its compoto transversely compress the blank to parnent member. tially close the axial grooves and make the The important feature of this invention threaded bore slightly elliptical in form. It resides in changing the contour of the bore should be understood that the threaded bore of the nut, after said nut has been cut, of the nut is reduced in diameter in only one punched and threaded in the standard mantransverse direction the opposite transverse ner. Changing the contour ofthe bore of direction retaining its original size. The the nut is accomplished by punching a plumeans employed to hold the nut while it is ra'lity of axial grooves entirely through said being compressed and the axial grooves closed nut, then transversely compressing the body will prevent the threaded bore from widenof said nut until the axial grooves are par ing beyond its original diameter. tially closed, causing the threaded bore of It is not necessary to have the axial grooves said nut to become slightly elliptical in conof predetermined depth or width to efiect tour, so that when the threads on the bolt the intended purpose, but practical demonare forced into en agement with the destrations of the results to be obtained have formed threads of tie nut, said nut will be proven that the proportions shown are best firmly held on the bolt in thedesired posisuited to accomplish the intended purpose. tion. By making, in the manner and the propor-' In the accompanying drawings: tions shown, the threaded bore of the nut Figure 1 is a plan view of the nut before elliptical, a uniform and definite lockingit is compressed. value is obtained from all threads of $9.1 Figure 2 is a transverse section of the samenut when it is applied to the bolt. on the line Z-Z of Figure 1. This improved nut in its general formation Figure 3 is a plan view of the nut after it and configuration, conforms 1n every par-- is compressed. ticular to the recognized standardas to size,

Figure 4 is a transverse section of the nut pitch and form. on the line Y-Y of Figure 1. The elliptical formation of the threads I Figure 5 is a plan view of the nut showing does not prevent said nut from being readily 6 the same before compression in full lines and applied to the end of a bolt, and with suffiafter compression in dotted lines; cient grip to permit the immediate and free o 2 V I 1,750,925

use of a wrench. The nut can be indefinitely a plied to and removed from the bolt without e ecting the permanency'of its locking efiicienc 5 I c aim: s

A lock nut having a threaded bore therethrough, said nut further having a pair of diametrically opposite grooves extending the length of the nut, said grooves opening into 10 said bore and bein of a width and depth ap-' proximating the depth of the threads, the

sides of the nut being compressed transversely to the grooves to make a portion at least of the bore slightly elliptical in form 15 and the threads of said portion substantially continuous circumferentially.

PAUL W. DIETER. 

